7 Night roundtrip Cruise from SF to Mexico over Spring Break ($600)

Looking to go on an awesome spring break but realized flights to Cabo have gotten too damn expensive? My four friends and I have booked a 7 night cruise from San Francisco to Mexico on Princess Cruises, March 19th - March 26th (http://www.princess.com/find/cruiseDetails.do?voyageCode=A608). The rooms sleep two, and we've essentially paid the price for two people in the last room, however currently there will only be one person in that room. Since we've already paid, we're just looking if someone else would like to come join in on the fun!